ETrees are of great importance when it comes to maintaining topsoil and slowing down the wind speed. In many Asian countries, firewood is the chief fuel used for cooking and heating, which has caused uncontrolled clear- cutting of forests in dryland ecosystems. When too many trees are cut dow...
Nowadays,the water pollution phenomenon can be seen everywhere.The factory let the waste into the rivers.People throw the rubbish into the rivers too.At last the water cant be drank.Some places even appear water poisoning.We have to stop these activities.We should step from a small startto p...
___(取决于)on where you are. In big (63) c___,such as Beijing, Shanghai, students usually ride bikes to school or take buses. And in places (64) w___ there are rivers and lakes, like Hongshanhu and Kaishandao, students usually,to school by boat. That must be a lot (65) m...
Nowadays,the water pollution phenomenon can be seen everywhere.The factory let the waste into the rivers.People throw the rubbish into the rivers too.At last the water cant be drank.Some places even appear water poisoning.We have to stop these activities.We should step from a small startto p...
Most bottled water is the same as tap water. Both tap and bottled water come from rivers and lakes. But bottled water is more expensive. It costs almost a thousand times more than tap water. Putting water in bottles also wastes water. Water is used to clean bottles first, and this is ...
How are South America's rivers important for economic development? How is home economics related to sociology? How does macroeconomics affect business? How is geography a social science? Why isn't money a factor of production in economics?
Environmental problems are becoming more and more serious all over the world. For example, cars have made the air unhealthy for people to breathe and poisonous gas is given off by factories. Trees on the hills have been cut down and waste water is being poured continuously into rivers.Further...
But this process for managing e-waste may be used in an unscrupulous (肆无忌惮的) way more often than not used, a recent report suggests. “A lot of these materials are being sent to developing nations under the excuse of reuse — to bridge the digital divide (消除数字鸿沟),” said ...
The first bridge might be formed by nature. A tree that fell across a river simply became a wooden bridge. It was strong enough for one person or two to walk on at a time, but not for too many people.37 Rope bridges are still used in China and other countries. They're strong enoug...
“Rivers are pretty sensitive indicators of what we’re doing to the surface of the Earth — they are sort of like a thermometer for land use change,” says co-author Carl Renshaw, the Evans Family Distinguished Professor of Earth Sciences at Dartmouth. “Yet, for rivers in the Northern He...